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Extras

Video thumbnail: How We Got to Now Episode 1 Preview | Clean

How We Got to Now

Episode 1 Preview | Clean

Host Steven Johnson reveals how clean water has changed our world.

Episode 1 Preview | Clean

Video thumbnail: How We Got to Now The Development of Chlorine

How We Got to Now

The Development of Chlorine

How did chlorination help purify drinking water in America?

The Development of Chlorine

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